A subatomic particle moves through the laboratory at \(0.90 c\). Laboratory experimenters measure its lifetime, from creation to annihilation, to be \(2.3 \mathrm{ps}\left(1 \mathrm{ps}=1\right.\) picosecond \(\left.=10^{-12} \mathrm{~s}\right)\). According to the particle, how long did it live?